kdump: Use http instead of ftp for debug repository

Fix poo#170422: FTP service on openqa.suse.de is not available due to
recent security changes and is better to use http for debug
repository.

lib/kdump_utils.pm

@@ -48,10 +48,11 @@ sub install_kernel_debuginfo {
 }
 
 sub get_repo_url_for_kdump_sle {
-    return join('/', $utils::OPENQA_FTP_URL, get_var('REPO_SLE_MODULE_BASESYSTEM_DEBUG'))
+    my $openqa_url = 'http://' . get_var('OPENQA_HOSTNAME', 'openqa.suse.de') . '/assets/repo';
+    return join('/', $openqa_url, get_var('REPO_SLE_MODULE_BASESYSTEM_DEBUG'))
       if get_var('REPO_SLE_MODULE_BASESYSTEM_DEBUG')
       and is_sle('15+');
-    return join('/', $utils::OPENQA_FTP_URL, get_var('REPO_SLES_DEBUG')) if get_var('REPO_SLES_DEBUG');
+    return join('/', $openqa_url, get_var('REPO_SLES_DEBUG')) if get_var('REPO_SLES_DEBUG');
 }
 
 sub prepare_for_kdump_sle {